Date: Tue, 22 Jan 2013 12:13:44 -0500 From: Jan Beich <jbeich@tormail.org> To: bug-followup@freebsd.org Cc: freebsd-toolchain@freebsd.org Subject: Re: ports/170256: audio/mpg123: SIGNAL 10 (SIGBUS) error Message-ID: <1TxhPU-000Hnu-3N@internal.tormail.org> In-Reply-To: <201207291139.q6TBdKt2011447@red.freebsd.org> (Julien Cigar's message of "Sun, 29 Jul 2012 11:39:20 GMT") References: <201207291139.q6TBdKt2011447@red.freebsd.org>
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The bug probably happens with every .mp3 file.
Program received signal SIGBUS, Bus error.
mpg123_strlen () at dct64_x86_64.S:117
117 movaps (%rcx), %xmm0
(gdb) bt
#0 mpg123_strlen () at dct64_x86_64.S:117
#1 0x000000080085e416 in INT123_synth_1to1_stereo_x86_64 (bandPtr_l=0x801c5a700,
bandPtr_r=0x801c5b000, fr=0x801c14000) at synth.c:430
#2 0x000000080086b55f in INT123_do_layer3 (fr=0x801c14000) at layer3.c:2028
#3 0x0000000800858c21 in decode_the_frame (fr=0x801c14000) at libmpg123.c:685
#4 0x00000008008595b7 in mpg123_decode_frame (mh=0x801c14000, num=0x624528,
audio=0x7fffffffda40, bytes=0x7fffffffda30) at libmpg123.c:824
#5 0x000000000040e445 in play_frame () at mpg123.c:661
#6 0x000000000040ff11 in main (sys_argc=2, sys_argv=0x7fffffffdd28)
at mpg123.c:1140
And this is caused by a broken .align check in configure.ac:
$ echo '.align 3' | clang -c -o /dev/null -x assembler -
$ echo '.align 3' | gcc47 -c -o /dev/null -x assembler -
{standard input}: Assembler messages:
{standard input}:1: Error: alignment not a power of 2
Exit 1
$ echo '.align 3' | as -o /dev/null
{standard input}: Assembler messages:
{standard input}:1: Error: alignment not a power of 2
Exit 1
No clue whose bug is this but here's a workaround.
--- configure.ac~
+++ configure.ac
@@ -838,21 +838,21 @@
dnl ############## Assembler, compiler properties
# based on posting from John Dalgliesh <johnd@defyne.org> on ffmpeg (LGPL) mailing list
# find if .align arg is power-of-two or not
asmalign_exp="unknown"
if test x"$asmalign_exp" = xunknown; then
AC_MSG_CHECKING([if .align takes 2-exponent])
asmalign_exp="no"
echo '.align 3' > conftest.s
- if $CCAS -c -o conftest.o conftest.s 1>/dev/null 2>&1; then
+ if $AS -c -o conftest.o conftest.s 1>/dev/null 2>&1; then
asmalign_exp="yes"
AC_MSG_RESULT([yes])
else
AC_MSG_RESULT([no])
fi
rm -f conftest.o conftest.s
fi
if test x"$asmalign_exp" = xyes; then
AC_DEFINE(ASMALIGN_EXP, 1, [ Define if .align takes 3 for alignment of 2^3=8 bytes instead of 8. ])
fi
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